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Sans the Bluetooth, something like the AKAI MPK Mini might fit? Not the greatest of keys, very plasticky, but it is cheap and has pots, keys, pads at least.

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Yes, it fits, but I am on a very tight budget, so I was hoping for a more affordable DIY option. Thanks for the recommendation, though!

Ah, for more a DIY approach, if you have an arduino and/or some basic components laying around, connecting a USB port that can do MIDI (or a DIN MIDI port) together with an Arduino or similar platform and some pots/buttons shouldn't be that hard and also there is a ton of resources online for building just that.

Just Hackaday have 45 articles on the subject of "MIDI Controller" :) https://hackaday.com/tag/midi-controller/

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